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Intangible Assets - Schedule of Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 642 $ 623 $ 1,937 $ 1,934